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by cohen's d three averages are away from one another.
effect size allows us to measure the magnitude of mean differences. This is usually calculated after rejecting the null hypothesis in a statistical test. If the null hypothesis is not rejected, effect size has little meaning.
cohen's d=
With cohen's d, remember that:
d = 0.2, small effect
d = 0.5, medium effect
d = 0.8, large effect
therefore, by cohen's d three averages are away from one another.
learn more about cohen's d here:
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